#include <stdio.h>
int main()
{
    char grade;
    scanf("%c",&grade);
    printf("Your score:");
    switch(grade)
    {
        case 'A': printf("85~100\n");break;
        case 'B': printf("70~84\n");break;
        case 'C': printf("60~69\n");break;
        case 'D': printf("<60\n");break;
        default: printf("enter data error!\n");
    }
    return 0;
}